It's not that I justified that steel song ships were Cadar made, it's just that I described that I don't buy steel song ships, but Cadar ships, because they are made from better material, with only some adjustments to look like steel song
Besides, if the passengers wanted to make ships, it wouldn't make sense they would fly to a planet where they are criminals
well, why Chinese restaurants appear in Europe? From the same reason... It has economic potential. If you open a Chinese restaurant in China, then you will have tough time making your place in all that competition. But if you open a Chinese restaurant in Europe, you have it easier, because in Europe the competition isn't too high. Also, it's something new and people like things that are new, especially if the new things aren't tied with harm. That is why these Cadar people wanted to go to Steel Song planets. They would have no chance of success in Cadar, but steel song planets? They had so huge profits just in first 7 AE of their existence. And that is welcome by the Steel Songs, because their teapots have better sales as well... overall it results in a huge reputation increase!